PC-98-31 - Laserfiche WebLink

. shall be planted in either low maintenance turf grasses or naturalized or native grasses; alterna- tively, the areas shall be separated from the creeks or drainage channels by vegetated natural buffer areas. Areas of high maintenance such as tees, fairways, and greens will be required to drain away from sensitive drainages. Areas between golf holes shall generally be left in naturalized grasses to catch and obstruct run- off. Where this is not possible, in particular where there are long continuous slopes, areas ' between golf holes shall be graded to minimize high velocity flows. . Manage discharge from subdrains. The Golf Course will be designed so that drain pipe dis- charge points from subdrains of greens or tees drain into vegetated swales or irrigation storage lakes. The subdrain discharge points may not be within 100 feet of a drainage channel. Dis- charge pipes must be directed to dense turf grass areas that can act as a biotic filter and allow percolation. The location of all drainages shall be indicated on the grading and drainage plans. In most cases, it should be possible to provide a minimum of 100 lineal feet of grassy swale treatment (a sinuous swale, if necessary to increase length) prior to discharge to creeks. Grad- ing and drainage systems shall be designed so that discharge occurs on the far side of the green or tee from the creek and, therefore, must travel in a grassy swale or thatch layer back around the tee or green to reach the creek. If sub drain discharge points must be within 100 feet of sen- sitive drainages to accommodate overall Golf Course design, alternative Best Management Practices (BMPs) shall be implemented to provide an equivalent level of runoff treatment. BMPs that may offer an equivalent level of treatment relative to 100 feet of overland or swale flow through turfgrass include infiltration (vaults or trenches) and media filtration (sand or sand/peat mixtures) features. . Minimize the use of high maintenance turf grass. The Golf Course Design and Management Plan shall reduce the amount of high maintenance turf grasses where possible. Turf grasses that require less fertilization, such as fescues and ryegrass, shall be used for larger areas of turf grass. Out-of-play areas shall use native plants, where possible. An efficient irrigation system shall be used. including a means of matching watering require- ments with the evapotranspiration rate of the plants. Runoff shall be recycled back into the irrigation system lhough use of irrigation storage lakes as collectors, wherever possible. These . requirements shall be indicated on the irrigation plans. . Minimize erosion by stabilizing creek channels. The plan requires that newly-constructed (relocated) creek channels be designed and constructed to be stable. In addition, unstable por- tions of existing channel shall be stabilized to prevent further channel incision. The design should avoid abrupt changes in channel gradient and creek channel restrictions to flow (e.g., abutments for in-channel golf cart bridges). The designers shall consider use of coarse rock fragments (such as cobbles and boulders) and vegetation within drainage swales and creeks to limit flow velocities and erosion of the channel bed, stabilize the channel banks, improve the aesthetic appearance, and provide for some runoff filtration/treatment. Rock and vegetation in creeks would also discourage golf play within the channel, minimizing potential water quality impacts caused by users of the Golf Course. 11